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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0070b4251f14dd95610b9dee422d18c946d7530dcfe6b196cecf9f3e1165a6a8' 
  AND token = 'NqXa6eDSTXnaP3avtx/ZUQ5FGVpnt0nuf5JjX0bvzXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}